You probably dont want to hear this, but you should remove the pump and overhaul it. Not knowing the sound its making, you are correct that it could be the cam striking the cam follower. This would be due to a broken piston spring, not holding the follower against the cam. Although the pump seems to be working well, this is a condition that can cause the pump to fail down the road, or tomorrow. This pump controls itself through a series of orifices and spool valves. If the wrong orifice becomes plugged, the pump cant unload and dangerously high pressure will result. This can happen if that spring continues to break up and circulate pieces through the system. On the bright side, it could continue to function as it is right now for the rest of our lives, but consider this: if our guess is correct, the pump is only running at 3/4 capacity right now, because one piston is not making a full stroke. So there is more hydraulic speed to be had for the cost of a handful of reasonably priced parts and one afternoon.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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